Create files from Grasscutter-Quests

these files are NOT directly compatible with Grasscutter, and require additional modifications to the codebase to work.

src/main/java/emu/grasscutter/data/custom/TrialAvatarActivityCustomData.java

@@ -0,0 +1,17 @@
+package emu.grasscutter.data.custom;
+
+import emu.grasscutter.data.common.BaseTrialActivityData;
+import lombok.*;
+import java.util.List;
+
+@Data
+public class TrialAvatarActivityCustomData implements BaseTrialActivityData {
+    private int ScheduleId;
+    private List<Integer> AvatarIndexIdList;
+    private List<Integer> RewardIdList;
+
+    public void onLoad() {
+        this.AvatarIndexIdList = AvatarIndexIdList.stream().filter(x -> x > 0).toList();
+        this.RewardIdList = RewardIdList.stream().filter(x -> x > 0).toList();
+    }
+}